5
Connect External Buzzer or Relay
The unit can drive an external relay output or a piezo buzzer. The component
specifications for the diagrams are:
Diodes: 1N4148/1N4002 or similar - observe the band when connecting
External relay: 12V DC, 470 ohm minimum coil resistance
Piezo buzzer: 12V DC, 3mA, 80dB(A) at one metre
Energizing a relay from the A or S connections
When the external relay is connected to the A connection, it will trigger for every
detection and deactivate immediately. By connecting the relay to the S connection, the
external relay stays active from 60s following the last detection.
+
+
S
S
A
A
mini
Opal
-
-
+
-
12V DC
GJD
Lighting
Controller
Figure 8: External relay wiring diagram
Driving a Piezo Buzzer from the A connection
This configuration can be useful as a temporary measure during your walk-test. The
piezo buzzer will sound every time a detection takes place.
+
+
S
S
A
A
mini
Opal
-
-
+
-
12V DC
GJD
Lighting
Controller
~
Figure 9: Piezo buzzer wiring diagram
